Trexler Nature Preserve

I went to college in the Lehigh Valley and was lucky to be exposed to lots of great Pennsylvania nature. Trexler Nature Preserve was one of my favorite places to escape to when the academic pressure got to me. Trexler has a trail system that spans just about 20 miles and whenever I went there, it was like a Choose Your Own Adventure book. My favorite thing about visiting Trexler is that they have bison onsite. One of the trails takes you right past them and on quiet nights sometimes my friends and I would head that way and go sing to the bison. Have you ever been to Trexler Nature Preserve? What about other good spots in Pennsylvania?